But if Trajan indeed has some interesting points in his game, he has, in my opinion, just as many weaknesses, if not more.

To transition to the last strong point we just discussed, I have serious concerns about Trajan's reading ability. While in a pass rush situation, he often makes no reads and simply attacks his gap, in zone coverage situations, it's much more complicated. Unlike his teammate Landon Jackson, he lacks the necessary reading skills, and most of the time, he seems content to cover grass without any awareness of his surroundings. I believe that if Trajan ends up on a team that requires him to drop into zone coverage a moderate or significant amount, it will take significant work on his reading and movement before we see him truly shine.

On the pass rush side, which is where Jeffcoat is most promising, I find him having the major flaw of power rushers; he spends far too much time grappling with his opponent. It's even more unfortunate when we see that despite what he thinks he is (a power rusher), Trajan is much better when he plays more technically and relies on his speed (like a speed rusher, ultimately).

The issue that arises, assuming a coach seeks to develop him today as a speed rusher, is that by remaining in the power rush mindset, Trajan has never truly worked on his Bend and he currently has a Bend which I would qualify as really average, and I would even say below what one might expect from a player like him.
Finally, despite a decent Swim move, a good burst, and decent explosiveness that could allow him to work his Speed to Power or even his Spin move rather fast and fluid, we see far too little use of the Counter move from Trajan. Again, this is a point that, if worked on properly, could allow Jeffcoat to greatly increase his effectiveness in pass rushing.

As I wrote a few lines above, Trajan wastes far too much time trying to battle against his opponents, but what bothers me even more is that he often does so by attacking with his head down upon contact. Besides being dangerous for his own health as well as that of his opponents, it's utterly foolish because due to this specific point, Trajan exacerbates his minor reading issues since he loses sight of the ball while lowering his head. And since he's no longer able to read the game, he also prolongs the time spent battling with the opposing blocker because he ends up having to catch up on what's happening but with a second's delay.
Furthermore, as I also mentioned above, although he believes himself to be a Power rusher, I think Trajan is mistaken on this point. While he can indeed show strength on certain reps thanks to his Takeoff it's primarily because he attacks most of the time by lowering his head like a ram and takes advantage of that. In my opinion, this doesn't make him a true Power rusher who dominates through genuine power in the legs, arms, punch, and resulting techniques. For a supposed Power rusher, he can sometimes struggle against powerful offensive linemen (as was the case this season against Alabama's Offensive Tackle JC Latham, for example) but also against some powerful tight ends. This isn't a good sign for the rest of his career when considering the beasts in the NFL at the OL position.

As for run-stopping situations, it's rather average based on his years at Mizzou. This season at Arkansas, in addition to having a very small sample size of plays with few reps on normal or heavy packages, on the reps where, despite a Pass rush-oriented package, the opposing team decides to run the ball, Trajan really struggles. So, it's challenging to assess him based on his current level. 

Finally, another warning sign I noticed this season, which I don't recall seeing in these kinds of situations during his seasons at Mizzou, is in situations of misplaced aggression. Therefore, it will be necessary to be careful of the unnecessary flags that Trajan can sometimes draw by making a wrong move.